Mag Tuneup Questions
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=56325
Printed Date: 09 Sep 2025 at 1:59pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Mag Tuneup Questions
Posted By: KenBWisc
Subject: Mag Tuneup Questions
Date Posted: 04 Sep 2012 at 10:31am
Tuned up the WD yesterday. Followed the instructions by Duey posted several years ago. Got the job done but still have questions.
I didn't find "a small timing mark inspection hole on the left side of the motor". I MAY have found a 'fire" mark on the bottom of the flywheel but can't be sure. I did find an inspection hole in front of the mag which lines up a raised, round bump in the hole at top dead center of the #1 piston.
The other issue which didn't seem to match the instructions is that my rotor does not line up with the #1 lug in the mag when the "C" mark on the mag timing gear is straight down but rather when the "A" mark is lined up straight down.
Slapped it together and it started right up and runs great including at barely running slow idle.
Please educate me on the differences stated above!
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'34 WC #629, '49 G, '49 B, '49 WD, '62 D-19, '38 All Crop 60 and still hunting!
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Replies:
Posted By: CTuckerNWIL
Date Posted: 04 Sep 2012 at 10:45am
First, the drive "lug" in the governor HAS to be horizontal when Number 1 piston is on TDC. Second, ANY wire can be number one depending on where the mag is in rotation when you connect it to the gov. housing.
With number 1 cylinder on TDC of compression stroke, you can rotate the mag til you get fire from the wire you want to be number 1, then back the mag up till it lines up with the drive.
I don't know how it is running if you have the A lined up when you put the mag together but if it runs right, you did sompin right and you got no worries.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: Dakota Dave
Date Posted: 04 Sep 2012 at 1:05pm
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The timing mark inspection hole is on the left side of the bell housing on B's and C's. On the WD / WD45's it is on the bottom of the bell housing there should be a plate with two wing bolts holding it on. The markings will be on the rear face of the flywheel. turn it over slowly by hand and find the marks and clean them up. I like to put white fingernail polish in the marks . it makes it very easy to see and use a timing light.
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